Sumi Kougyoku Medaka (Japanese Ricefish). USA Homebred | BARCK Aquatics

Sumi Kougyoku Japanese Rice (Medaka) Homebred in the USA. The fish are freshwater, cold and warm water hardy, and peaceful, making them suitable for beginners. The lineage is of high quality and is ideal for those looking to start breeding medaka.

These are USA homebred. Very hardy and can be kept outdoors in many areas of the United States year round. The photos of the adults for this listing are the parents.

Very beautiful medaka. Sumi Kougyoku Medaka are known for their striking, high-contrast black, white, and marbled or blotchy coloration, and taigaikou (external light).

The Sumi Kougyoku is a specialized variant of the renowned Kōgyoku (紅玉) Medaka lineage. Here is a breakdown of how the strain was developed:

1. The Original Kōgyoku Lineage

The foundation for this fish is the Kōgyoku Medaka (meaning "Ruby" or "Red Jewel"), which was originally developed and released in September 2018 by the highly respected Japanese breeder Manabu Tange (of Medaka no Beans in Ehime Prefecture, Japan). The original Kōgyoku was celebrated for successfully combining a vivid tri-color pattern (orange/red, white, and black) with a striking metallic dorsal shine known as taigaikō (external light).

2. Selectively Breeding for "Sumi" (Ink)

In Japanese, Sumi (墨) translates to "ink" or "black". As the Kōgyoku strain gained popularity, breeders began isolating and selectively breeding generations to heavily emphasize the deep, ink-like black mottling and marbled contrast. By prioritizing genetics that display intense black patches, the "Sumi Kougyoku" was established.

DOA policy is if you provide pictures within 1 hour of delivery of unopened bag/vial showing DOAs, I’ll send replacements or refund the cost. DOAs are extremely rare, but with live animal shipping there is always some risk.

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